MICRF405

Supply Voltage (V_DD).........................................+3.7V
Voltage on any pin⁽¹⁾ (GND = 0V). .. -0.3V to 3.7V
Lead Temperature (soldering, 20sec.)........... 260°C
Storage Temperature (Ts) ...........-55°C to +150°C
ESD Rating⁽²⁾
All pins except pin 4...................................... 2 kV
Pin 4 (RFOUT)............................................. 200 V

1. On the pins RFVDD (3), PTATBIAS (6), DVDD (9), CPOUT (20), VARIN (21) and AVDD (23), the maximum input voltage should not exceed 2.75V.
2. Devices are ESD sensitive. Handling precautions recommended. Pin 4, RFOUT, has less ESD protection (Human body model (HBM) of 200V and Charged Device Model (CDM) of 500V).

The MICRF405 is a 290MHz-980MHz RF transmitter IC designed for unlicensed ISM band operations. It's designed to work in the North American 315MHz and 915MHz bands as well as the European 433MHz and 868MHz bands. The device is fully FCC Part 15.247 and EN300-220-compliant.

The transmitter MICRF405 consists of a FSK/ASK modulator,PLL frequency synthesizer and a power amplifier.The frequency synthesizer of MICRF405 consists of a voltagecontrolled oscillator (VCO), a crystal oscillator, dual modulus prescaler, programmable frequency dividers and a phase-detector. The loop-filter can be internal or external. The output power of the power amplifier can be programmed to eight levels. A lock detect circuit detects when the PLL is in lock.In FSK mode, the user can select between three different modulation types allowing a data rate up to 200kbps. When selecting FSK modulation applied with dividers, the MICRF405 is switching between to sets of register values (M0,N0,A0:"0" and M1,N1 and A1:"1"). The second modulation type is closed loop VCO modulation using the internal modulator that applies the modulated data to the VCO. The third FSK modulation type is Open loop VCO modulation.

In ASK modulation, the user of MICRF405 can select between two modulation types, with or without spreading. In both modes the modulation depth is programmable.